March 15th, 2017, 07:43 AM  #1 
Member Joined: Feb 2014 Posts: 91 Thanks: 1  Disk and string
There were so many ways to do this. I tried but if you have a better method than please share it. Anyways here was my attempt did I mess up this time? 
March 15th, 2017, 07:59 AM  #2 
Math Team Joined: Jul 2011 From: Texas Posts: 2,721 Thanks: 1375 
Energy conservation is the method I'd use ... I agree with your solution if you accompany it with the correct units for speed.

March 15th, 2017, 09:28 AM  #3 
Senior Member Joined: Apr 2014 From: Glasgow Posts: 2,090 Thanks: 701 Math Focus: Physics, mathematical modelling, numerical and computational solutions 
Yep, looks fine to me... just missing the units from the final velocity.


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